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, y <br /> t Sequoia 680 Chesapeake Drive Redwood City CA 94063 -(q 15) 364 9600 - FAX(415)`364 9'233 <br /> 1900 Batts Avenue Suite L Concord CA 94520 (510) 686 9600 FAX (510) 686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 14Geocon Client Project ID 58080-06-02 <br /> 11333 Sunco Dr, Suite 100 Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention John Juhrend QC Sample Goup 4110841-845 Reported Dec 1, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> y ANALYTE Ethyl- " <br />' Benzene Toluene Benzene Xylenes Diesel <br /> EPA <br /> Method' EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod <br /> Analyst C Chapman C Chapman C Chapman C Chapman C Lee <br /> Concentration <br /> Spiked '° 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 7 5 mg/kg <br />' LCS Batch# LCS112494 LCS112494 LCS112494 LCS112494 LCS112294 <br /> Date Prepared 11/24/94 11/24/94 11/24/94 11/24/94 11/22/94 1 <br />' Date Analyzed 11/24/94 11/24/94 11/24/94 11/24/94 11/23/94 <br /> + u <br /> Instrument I D.# GCHP-2 GCHP-2 GCHP-2 GCHP 2 GCHP-38 n <br /> LCS <br /> Recovery. 100 92 101 100 93 <br /> Control Limits. 75-125 75-125 75-125 75-125 60-130 <br /> MS/MSD <br />' Batch'#: 4110831 4110831 4110831 4110831 4110845, <br /> Date Prepared 11/24/94 11/24/94 11/24/94 11/24/94 11/22/94 <br /> Date Analyzed, 11/24/94 11/24/94 11/24/94 11/24/94 11/23/94 r <br /> instrument LD # GCHP-2 GCHP-2 GCHP-2 GCHP-2 GCHP-3B I <br /> Matrix Spike <br />' %Recovery, 100 90 100 100 100 <br /> Matrix Spike <br /> Duplicate% 14 <br /> Recovery: 100 95 100 98 ' 92 <br /> Relative% I <br /> Difference. 00 54 00 2 0 83 <br /> I <br /> SEQUOIA ANALYTICAL Please Dote <br /> The LCS Is a control sample of known,Interferent free matrix that Is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data Is used for <br /> r t i validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> J nle Higgins and are not used to accept or reject batch results <br /> Project Manager <br />' 4110841 GEC <4> <br /> I <br />